Stop Light Control Relay Malfunction - Vehicle Stability Control System

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1380/64: Stop Light Control Relay Malfunction

DTC C1380/64 - Stop Light Control Relay Malfunction

DESCRIPTION

The skid control ECU inputs the stop light switch signal and detects the status of the brake operation.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: When replacing the ABS and TRACTION actuator, perform zero point calibration .

PROCEDURE

1. CHECK STOP LIGHT (OPERATION)
(a) Check that the light illuminates when the brake pedal is depressed, and turns off when the brake pedal is released.

OK





NG -- CHECK WIRE HARNESS (STOP LIGHT SWITCH - BATTERY)
OK -- Continue to next step.
2. CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY)





(a) Disconnect the A19 ECU connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
3. CHECK WIRE HARNESS (SKID CONTROL ECU)





(a) Disconnect the A19 ECU connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
4. PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT RELAY)
(a) Select the Active Test, generate a control command, and then check that the stop light relay operates.

ABS / VSC / TRAC:





OK:
The stop lights illuminate or turn off.
NG -- INSPECT STOP LIGHT CONTROL RELAY (Marking: BRK)
OK -- Continue to next step.
5. RECONFIRM DTC
(a) Clear the DTC .
(b) Start the engine.
(c) Drive the vehicle at a speed of 5 km/h (3 mph) or more for several seconds.
(d) Check if the same DTC is output .

Result





B -- USE SIMULATION METHOD TO CHECK
A -- REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY
6. INSPECT STOP LIGHT CONTROL RELAY (Marking: BRK)





(a) Remove the stop light control relay from the engine room No. 1 relay block.
(b) Measure the resistance of the relay.
Standard resistance:






NG -- REPLACE STOP LIGHT CONTROL RELAY
OK -- Continue to next step.
7. CHECK WIRE HARNESS (ENGINE ROOM NO. 1 RELAY BLOCK - SKID CONTROL ECU AND BATTERY)





(a) Remove the stop light control relay.
(b) Disconnect the A19 ECU connector.
(c) Measure the voltage of the wire harness side connector.
Standard voltage:





(d) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
8. RECONFIRM DTC
(a) Clear the DTC .
(b) Start the engine.
(c) Drive the vehicle at a speed of 5 km/h (3 mph) or more for several seconds.
(d) Check if the same DTC is output .

Result





B -- USE SIMULATION METHOD TO CHECK
A -- REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY
9. CHECK WIRE HARNESS (STOP LIGHT SWITCH - BATTERY)





(a) Disconnect the A3 switch connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
10. INSPECT STOP LIGHT SWITCH ASSEMBLY





(a) Remove the stop light switch connector.
(b) Measure the resistance of the switch.
Standard resistance:






NG -- REPLACE STOP LIGHT SWITCH ASSEMBLY
OK -- Continue to next step.
11. CHECK WIRE HARNESS (STOP LIGHT SWITCH - STOP LIGHT CONTROL RELAY)





(a) Disconnect the A3 switch connector.
(b) Remove the stop light control relay.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
12. INSPECT STOP LIGHT CONTROL RELAY (Marking: BRK)





(a) Remove the stop light control relay from the engine room No. 1 relay block.
(b) Measure the resistance of the relay.
Standard resistance:






NG -- REPLACE STOP LIGHT CONTROL RELAY
OK -- Continue to next step.
13. CHECK WIRE HARNESS (STOP LIGHT AND REAR COMBINATION LIGHT - CONTROL RELAY)





(a) Disconnect the Q1, K12 and K14 light connectors.
(b) Remove the stop light control relay.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- CHECK USE SIMULATION METHOD TO CHECK